i may still have alot of communication with the guys at Quaife, they spoke to me in detail about what problems they had whit these boxes.
mainly the reverse ideler, he simply put the reverse gear will always wear out, they focused on making 6 strong forward gears, now the gears themselves are pretty strong, where that shaft snapps is another problem, i was led to believe it was caused from a bent or loose selector fork selevting two gears at once. not too sure who told me that it may have been quaife...